bush who was there with clinton and carter, as you mention, standing up and giving president obama a standing ovation along with many others in the crowd after his speech. his speech did seem to go over very well, as you point out. special relationship being the first african-american president of the united states. before i let you go, any favorite moment from the day? >> reporter: well, you know, for me, i was just so struck by this amazing portrait of grief that was the face of graca machel, nelson mandela's widow. she is such a beautiful woman. they married very late. he was 80 years old when they got married. she had been widowed. she had been previously married to the freedom fighter, a great liberator of mozambique who cast off portuguese colonialism and became the first black president there. to think of all that time she spent with mandela in his last years, this beautiful face in this real grief was quite something to see. >> yes, of course. behind it all, a human being with loved ones. christiane amanpour, thank you so much. >>> coming up on "the lead," he defended his com